Products Presentation

Three traditional methods to connect steel pipes, namely welding, flange connection and screwconnection.

Grooved piping system use the grooved couplings & branch outlet fittings as the key,supplemented by a variety of non-gasket pipefittings, This is a pipe connection revolution. Atpresent, CNG manufactures all kinds of grooved branch outlet fittings and non-gasket fittings. Inorder to meet the needs of customers, CNG also developed extended products such as groovedend valves, filters, etc. CNG will continue to improve and optimize so that the company'sproduct line can fulfill demands in civil construction, municipal and industrial fields..

Groove piping system is an universal, economic, safe and practical piping systemcomponents, the installation process will not bring any pollution to the pipeline. lt is an
environmentally friendly green product.

Groove piping system builds pipe connection on the external surface of steel pipes. Theinner diameter & interior surface of the pipe has no matter of the connection, which makes therange of application of this product much more extended.

Products Strong Point

Compared with the traditional piping methods such as welded, flanges or threaded connection,the grooved and mechanical outlet fittings has very significant advantages, mainly in thefollowing aspects:

	◆ Rigid ⊙ Rigid coupling providesenough rigidity to resisttube twisting and bendingmoment.
	◆ Noise and vibration ⊙The separation betweenpipe ends reduces thetransmission of noise andvibration,provides theentire system a significant dampening effect.
	◆ system maintenance ⊙System unit can bedisassembled without movingthe pipeline, thus facilitatingsystem maintenance and modification.
	◆ Flexibility ⊙ Flexible coupling providesradial and axial deflection.It absorbs expansion,contraction,deflection andvibration.
	◆ Earthquake stress ⊙ The full circumferential engage between couplings keys and pipe groovesprovides sufficient internal pressure and pipe end load capacity to withstand pipe movement.
	◆ Easy alignment ⊙ Groove system allows free rotation of pipe and system components prior final fixing.

Warning

Before attempting to install, disassemble, and adjust any CNG product,please depressurize anddrain the plumbing system. Failure to do this may result in personal injury, property damage, leaksand/or other potential function failure.

Products Component

● Housing

Material：Ductile cast iron conforming to ASTM A-536, Grade 65-45-12.

Surface Finish：Standard：Epoxy powder coating

Optional：Galvanized (Zinc Plated、HDG), Dip painted

Surface Color：Variable colors for choice

● Rubber Gasket

Standard: EPDM.

Optional：Nitrile, Silicone, Fluoroelastomer, Neoprene

The sealing mechanism of grooved couplings and mechanical outlets is basically the same,the main structure of the gasket has "C" shape, forming a triple seal function. The first seal is formed by the elasticity of the gasket during the static state. After the coupling is installed,the gasket is confined by the housing of groove coupling or the mechanical outlet, the second seal is formed. Medium inside the pipe system press the "C" cavity after pressurizing, it increases the adhesion between gasket lip and steel pipe surface, so as to achieve the third reactive seal. The greater the pressure of the fluid within the pipe, The better the sealing of the coupling.

The material of the gasket must be chosen to follow the characteristics of the fluid medium below. The commonly used gasket are shown in the following table:

◆ As the manufacturer and innovator of grooved coupling technology,  offers a variety of coupling sizes and styles for almost any piping application.

◆ All grooved couplings are made up of four parts,namely housing, gasket, bolt and nut. Housing is made of ductile iron, surface finish is orange, but also for a variety of fluid piping system to provide matching color scheme; standard gasket material is EPDM,also prepared for a variety of pipeline media rubber material. The bolt's tensile rating is class 8.8 and the nut's rating 8.0.

◆ CNG couplings provide pipe system with versatility not found in other pipe connection methods. CNG rigid and flexible couplings can be combined to allow for thermal growth within the system. Additionally, the use of three consecutive flexible couplings reduces noise and vibration and eliminates costly noise dampeners.

Flexible Coupling Systems & Performance

The structure of the socket type rigid coupling is compact,with the inner and outer female and male teeth, socket type,meshing design, the use of the gap between the female andmale port socket combination of pipe and joint meshing toachieve the rigid requirements.

Due to the improved interface structure, it is not easy to makethe gasket to produce transverse and oblique twists and turns,the positioning of the gasket is more accurate, the abnormalpressing and destructive pressure loss of the gaskets areavoided, the sealing property is increased, and the overalljoint is increased service life.

◆ Style 1N standard flexible coupling provides flexible connection by the gap between pipe groove and coupling key.

◆ Unique design allows bothaxial and radial movement,suitable for pipeline with flexibility under intermediate pressure.

◆ Enhanced body resists 4 times working pressure.

◆ Housing material：Ductile iron conforming to ASTM A-536, grade 65-45-12.

◆ FM Approved & UL Listed：R.W.P. rated working pressure 300PSI(2.065MPa / 20.65bars)

◆ Housing Finish：Fusion Bonded Epoxy Coated（Optional：Hot Deep Galvanized and Others）

◆ Coupling gasket material：EPDM（Optional：Nitrile NBR，Silicone and Others）

◆ Bolts and Nuts：Heat treated and electro galvanized bolts with oval neck, and heavy duty hexagon nuts. Track head meeting the physical and chemical requirements of ASTM A-449 and physical requirements of ASTM A-183.

◆ Size Range：DN25 through DN300 (1″ through 12″).